Yes!

I know, I know, I did it only because I was curious if that CMDR was trolling us, and moreover because if I see something new, or that I did not know, I have to try it myself. I don't think that song/music is relevant or useful. The most that it can be is an easter egg, like Braben face in the other spectrogram.
Well done CMDR! I've checked it and I can confirm we have Braben face, Elite logo, Frontier logo, a wireframe Cobra, And SOME MORSE CODE LIKE glyohs on the middle/upper part of the spectrogram.
I'll post them later, I've them on my PC at home.
And YES, the UP does not react while in hold: it needs to be outside to reply. Anyway, I cannot deny that some other result could be obtained with UP in hold, while doing THINGS SOMEWHERE.